<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>数据统计</el-breadcrumb-item>
        <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 2.为 ECharts 准备一个具备大小（宽高）的 DOM -->
           <div id="main" style="width: 750px; height:400px;"></div>
        </el-card>
    </div>
</template>

<script>
//1.导入echarts
//import echarts from 'echarts'

import _ from 'lodash'

export default {
   data(){
    return{

        //需要合并的数据
        options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
    }
   },
   created(){},

   //此时，页面上的元素已经被渲染完毕了！
   async mounted(){
       // 3.基于准备好的dom，初始化echarts实例
        var myChart = this.$echarts.init(document.getElementById('main'));

        const{data:res} = await this.$http.get('reports/type/1');
        if(res.meta.status !== 200){
            return this.$message.error('获取折线数据失败！')
        }

       //4. 准备数据和配置项
      const result =  _.merge(res.data, this.options) //将res.data 与 this.options 进行合并，实现鼠标跟随的效果

       //5.展示数据
        myChart.setOption(result)


   },
   methods:{
   }
}
</script>

<style scoped>

</style>